Pen



FIG. 1. is a first perspective view of the pen with the cap in the closed position;

FIG. 2 is a second perspective view of the pen with the cap in the closed position;

FIG. 3 is top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is a perspective view thereof with the cap in the open position; and,

FIG. 10 is a second perspective view thereof with the cap in the open position.

The broken lines are included to show portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 